[英]Firestore pagination with react-redux
I try to add pagination using firebase and react redux-toolkit.我尝试使用 firebase 添加分页并反应 redux-toolkit。 I get the logic but having trouble using it with redux.我明白了逻辑,但无法将其与 redux 一起使用。
At first I wanted to set lastDoc in redux state but I got error since it is an object.起初我想在 redux state 中设置 lastDoc 但我得到了错误,因为它是 object。
Then I changed the way and started to keep id of last document in the state.然后我改变了方式,开始在 state 中保留最后一个文档的id 。 But then I can't get the firebase doc itself但是我无法获得 firebase文档本身
const lastDocRef = firestoreDB.doc(`catalog/${publishedBooks.lastDocId}`)
is not same with不一样
const lastDoc = snap.docs[snap.docs.length-1];
I appreciate any help how to solve this.我感谢任何帮助如何解决这个问题。
import { createSlice, createAsyncThunk, createEntityAdapter } from '@reduxjs/toolkit';
import firebaseService from 'app/services/firebaseService';
const firestoreDB = firebaseService.firestoreDB;
export const getPublishedBooks = createAsyncThunk('adminApp/publishedBooks/getPublishedBooks',
async (params, { dispatch, getState }) => {
const promise = firestoreDB
.collection('catalog')
.orderBy('lastPublish', 'desc')
.limit(10)
.get()
.then(snap => {
const lastDoc = snap.docs[snap.docs.length-1];
dispatch(setLastDocId(lastDoc.id));
let books = [];
snap.forEach(bookDoc => {
const id = bookDoc.id;
const data = bookDoc.data();
const lastPublish = data.lastPublish.toDate().toISOString();
books.push({ ...data, id, lastPublish });
});
return books;
})
.catch(error => {
return {}
});
const result = await promise;
return result;
}
);
export const getPublishedBooksNext = createAsyncThunk('adminApp/publishedBooks/getPublishedBooksNext',
async (params, { dispatch, getState }) => {
const { publishedBooks } = getState().adminApp;
const lastDocRef = firestoreDB.doc(`catalog/${publishedBooks.lastDocId}`)
const promise = firestoreDB
.collection('catalog')
.orderBy('lastPublish', 'desc')
.startAfter(lastDocRef)
.limit(10)
.get()
.then(snap => {
const lastDoc = snap.docs[snap.docs.length-1];
dispatch(setLastDocId(lastDoc.id));
let books = [];
snap.forEach(bookDoc => {
const id = bookDoc.id;
const data = bookDoc.data();
const lastPublish = data.lastPublish.toDate().toISOString();
books.push({ ...data, id, lastPublish });
});
return books;
})
.catch(error => {
return {}
});
const result = await promise;
return result;
}
);
const publishedBooksAdapter = createEntityAdapter({});
const initialState = publishedBooksAdapter.getInitialState({
lastDocId: null
});
export const {
selectAll: selectPublishedBooks,
selectById: selectPublishedBookById,
selectTotal: selectPublishedBooksTotal
} = publishedBooksAdapter.getSelectors(state => state.adminApp.publishedBooks);
const publishedBooksSlice = createSlice({
name: 'adminApp/publishedBooks',
initialState,
reducers: {
resetPublishedBooks: (state, action) => initialState,
setLastDocId: {
prepare: doc => {
const payload = doc
return { payload };
},
reducer: (state, action) => {
state.lastDocId = action.payload;
}
},
resetLastDocId: {
prepare: () => {
const payload = null
return { payload };
},
reducer: (state, action) => {
state.lastDocId = action.payload;
}
},
},
extraReducers: {
[getPublishedBooks.fulfilled]: publishedBooksAdapter.setAll,
[getPublishedBooksNext.fulfilled]: publishedBooksAdapter.upsertMany
}
});
export const { resetPublishedBooks, setLastDocId, resetLastDocId } = publishedBooksSlice.actions;
export default publishedBooksSlice.reducer;
lastDocRef
only returns the doc reference. lastDocRef
只返回文档引用。 You need to get the actual doc itself.您需要获取实际的文档本身。
const lastDocRef = await firestoreDB.doc(`catalog/${publishedBooks.lastDocId}`).get();
And you should use await
instead of then-catch
for more readble code.你应该使用await
而不是then-catch
以获得更易读的代码。
export const getPublishedBooksNext = createAsyncThunk('adminApp/publishedBooks/getPublishedBooksNext',
async (params, { dispatch, getState }) => {
const { publishedBooks } = getState().adminApp;
try {
const lastDocRef = await firestoreDB.doc(`catalog/${publishedBooks.lastDocId}`).get();
const snap = await firestoreDB
.collection('catalog')
.orderBy('lastPublish', 'desc')
.startAfter(lastDocRef)
.limit(10)
.get()
const lastDoc = snap.docs[snap.docs.length-1];
let books = [];
dispatch(setLastDocId(lastDoc.id));
snap.forEach(bookDoc => {
const id = bookDoc.id;
const data = bookDoc.data();
const lastPublish = data.lastPublish.toDate().toISOString();
books.push({ ...data, id, lastPublish });
});
return books;
} catch (error) {
return {}
}
}
);
Edit: You can also save the lastDoc
to redux then reference it later to avoid additional workload fetching for the lastDocRef.编辑:您还可以将lastDoc
保存到 redux 然后稍后引用它以避免为 lastDocRef 获取额外的工作负载。
export const getPublishedBooksNext = createAsyncThunk('adminApp/publishedBooks/getPublishedBooksNext',
async (params, { dispatch, getState }) => {
const { lastDocRef } = getState().adminApp; // get saved lastDoc
try {
const snap = await firestoreDB
.collection('catalog')
.orderBy('lastPublish', 'desc')
.startAfter(lastDocRef) // use it here.
.limit(10)
.get()
const lastDoc = snap.docs[snap.docs.length-1];
let books = [];
// dispatch(setLastDocId(lastDoc.id)); // instead of saving the doc id
dispatch(setLastDoc(lastDoc)); // save the last document instead
snap.forEach(bookDoc => {
const id = bookDoc.id;
const data = bookDoc.data();
const lastPublish = data.lastPublish.toDate().toISOString();
books.push({ ...data, id, lastPublish });
});
return books;
} catch (error) {
return {}
}
}
);
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